If you are a self-visit, due to possible autism symptoms
Then Doctors would observe your child during the few minutes they have with you, before referring them to a specialist.
After where children will get a specialize doctor to diagnose and observe their child if they shown the common symptoms of Autism or anything else within the spectrum.
Depending on what your doctor tells you, your child might be referred to these places.
Psychology Therapy
Occupational Therapy
Educational Therapy
Speech Language Therapy